• 제목/요약/키워드: heat conduction analysis

검색결과 462건 처리시간 0.024초

평면충돌제트에 의한 고온 판 냉각과정의 열전달 해석 (Analysis of Heat Transfer in Cooling of a Hot Plate by Planar Impingement Jet)

  • 안대환;김동식
    • 대한기계학회논문집B
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    • 제33권1호
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    • pp.17-27
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    • 2009
  • Water jet impingement cooling is used to remove heat from high-temperature surfaces such as hot steel plates in the steel manufacturing process (thermo-mechanical cooling process; TMCP). In those processes, uniform cooling is the most critical factor to ensure high strength steel and good quality. In this study, experiments are performed to measure the heat transfer coefficient together with the inverse heat conduction problem (IHCP) analysis for a plate cooled by planar water jet. In the inverse heat transfer analysis, spatial and temporal variations of heat transfer coefficient, with no information regarding its functional form, are determined by employing the conjugate gradient method with an adjoint problem. To estimate the two dimensional distribution of heat transfer coefficient and heat flux for planar waterjet cooling, eight thermo-couple are installed inside the plate. The results show that heat transfer coefficient is approximately uniform in the span-wise direction in the early stage of cooling. In the later stage where the forced-convection effect is important, the heat transfer coefficient becomes larger in the edge region. The surface temperature vs. heat flux characteristics are also investigated for the entire boiling regimes. In addition, the heat transfer rate for the two different plate geometries are compared at the same Reynolds number.

석탄 가스화 용융 슬래그의 비열 및 미소수화열 특성 (The Characteristics of Isothermal Conduction Calorimetry and Specific Heat in Coal Gasification Slag)

  • 한준희;후윈야오;임군수;김수호;김종;한민철
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2021년도 가을 학술논문 발표대회
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    • pp.182-183
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    • 2021
  • In this study, This is the result of thermal characteristics analysis to suggest an efficient method of using coal gasification slag(CGS) of byproduct from integrated gasification combined cycle(IGCC). In Specific Heat characteristics, CGS and CS showed similar values. Isothermal Conduction Calorimetry showed that the hydration reaction of cement was retarded when CGS was used. Therefore, it is expected that CGS will be used as an efficient alternative to reducing the hydration heat of mass concrete as a functional aggregate combination.

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유속 및 열전대 위치의 영향을 고려한 열경계층 내부의 복합열전달 해석 (NUMERICAL ANALYSIS OF CONJUGATE HEAT TRANSFER INSIDE A THERMAL BOUNDARY LAYER CONSIDERING THE EFFECTS OF A FREE STREAM VELOCITY AND A THERMOCOUPLE POSITION)

  • 전병진;이주안;최형권
    • 한국전산유체공학회지
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    • 제18권1호
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    • pp.77-82
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    • 2013
  • The error in measuring temperature profiles by thermocouple inside boundary layer mostly comes from the conduction heat transfer of the thermocouple. The error is not negligible when the conductivity of the thermocouple is very high. In this study, the effect of conduction heat transfer of the thermocouple on the temperature profile inside boundary layer was examined by considering both free-stream velocity and a thermocouple position. The conduction error of an E-type thermocouple was investigated by numerical analysis of three-dimensional conjugate heat transfer for various velocity profiles of boundary layer and thermocouple positions.

축방향 열전도와 유로 변형을 고려한 인쇄기판형 열교환기 열적 성능 (Thermal Performance of a Printed Circuit Heat Exchanger considering Longitudinal Conduction and Channel Deformation)

  • 박병하;사인진;김응선
    • 한국압력기기공학회 논문집
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    • 제14권1호
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    • pp.8-14
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    • 2018
  • Printed circuit heat exchangers (PCHEs) are widely used with an increasing demand for industrial applications. PCHEs are capable of operating at high temperatures and pressure. We consider a PCHE as a candidate intermediate heat exchanger type for a high temperature gas-cooled reactor (HTGR). For conventional application using stainless steels, design and manufacturing of PCHEs are well established. For applications to HTGR, knowledge of longitudinal conduction and deformation of channel is required to estimate design margin. This paper analyzes the effects of longitudinal conduction and deformation of channel on thermal performance using a code internally developed for design and analysis of PCHEs. The code has a capability of two dimensional simulations. Longitudinal conduction is estimated using the code. In HTGR operating condition, about ten percent of design margin is required to compensate thermal performance. The cross-sectional images of PCHE channels are obtained using an optical microscope. The images are processed with computer image process technique. We quantify the deformation of channel with dimensional parameters. It is found that the deformation has negative effect on structural integrity. The deformation enhances thermal performance when the shape of channel is straight in laminar flow regime. It reduces thermal performance in cases of a zigzag channel and turbulent flow regime.

열교환기에서의 연성 시뮬레이션 해석 (Ductile Simulation Analysis at Heat Exchanger)

  • 조재웅;한문식
    • 한국기계가공학회지
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    • 제7권3호
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    • pp.50-54
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    • 2008
  • This study is analyzed by the simulation of heat exchanger. As heat conduction happens as contact begins, the temperature increases until $70^{\circ}C$ at the contact part. The displacement increases until 33mm at its maximum and maximum equivalent stress at final stage increases 20 times as much as that of first contact. The expenses about maintenance, repair and management of parts can be reduced largely by applying the simulation about various parts of heat exchanger.

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돌출된 열원이 있는 채널에서 대류와 전도열전달을 이용한 냉각특성 (Cooling Characteristics of a Parallel Channel with Protruding Heat Sources Using Convection and Conduction Heat Transfer)

  • 손영석;신지영
    • 설비공학논문집
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    • 제14권11호
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    • pp.923-930
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    • 2002
  • Cooling characteristics of a parallel channel with protruding heat sources using convection and conduction heat transfer are studied numerically. A two-dimensional model has been developed for numerical prediction of transient, compressible, viscous, laminar flow, and conjugate heat transfer between parallel plates with uniform block heat sources. The finite volume method is used to solve the problem. The assembly consists of two channels formed by two covers and one printed circuit board which has three uniform heat source blocks. Six different cooling methods are considered to find out the most efficient cooling method in a given geometry and heat sources. The velocity and temperature fields of cooling medium, the temperature distribution along the block surface, and the maximum temperature in each block are obtained. The results are compared to examine the cooling characteristics of the different cooling methods.

REDUCED DIFFERENTIAL TRANSFORM FOR THERMAL STRESS ANALYSIS UNDER 2-D HYPERBOLIC HEAT CONDUCTION MODEL WITH LASER HEAT SOURCE

  • SUTAR, CHANDRASHEKHAR S.;CHAUDHARI, KAMINI K.
    • Journal of the Korean Society for Industrial and Applied Mathematics
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    • 제25권2호
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    • pp.54-65
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    • 2021
  • In this study, a two-dimensional thermoelastic problem under hyperbolic heat conduction theory with an internal heat source is considered. The general solution for the temperature field, stress components and displacement field are obtained using the reduced differential transform method. The stress and displacement components are obtained using the thermal stress function in the reduced differential transform domain. All the solutions are obtained in the form of power series. The special case with a time-dependent laser heat source has been considered. The problem is considered for homogeneous material with finite rectangular cross-section heated with a non-Gaussian temporal profile. The effect of the heat source on all the characteristics of a material is discussed numerically and graphically for magnesium material taking a pulse duration of 0.2 ps. This study provides a powerful tool for finding the solution to the thermoelastic problem with less computational work as compared to other methods. The result obtained in the study may be useful for the investigation of thermal characteristics in engineering and industrial applications.

3차원 해석적 방법에 의한 사다리꼴 휜 해석 (Trapezoidal Fin Analysis by the 3-D Analytical Method)

  • 이성주;강형석
    • 설비공학논문집
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    • 제12권4호
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    • pp.388-397
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    • 2000
  • Comparison of the heat conduction into a trapezoidal fin and the heat loss from the fin by convection is made in this study Also, the ratio of heat loss from each surface to the total heat loss and the temperature distribution are analyzed using a 3-D analytical method. A trapezoidal fin whose tip height is half the root height is chosen as the model. The results show that the heat transfer rates from the tip and from both sides are comparable with each other as the non-dimensional width and length vary while the heat transfer rate from the bottom and top is dominant.

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최대엔트로피법을 이용한 역열전도문제의 해석 (Analysis of an Inverse Heat Conduction Problem Using Maximum Entropy Method)

  • 김선경;이우일
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2000년도 춘계학술대회논문집B
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    • pp.144-147
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    • 2000
  • A numerical method for the solution of one-dimensional inverse heat conduction problem is established and its performance is demonstrated with computational results. The present work introduces the maximum entropy method in order to build a robust formulation of the inverse problem. The maximum entropy method finds the solution that maximizes the entropy functional under given temperature measurement. The philosophy of the method is to seek the most likely inverse solution. The maximum entropy method converts the inverse problem to a non-linear constrained optimization problem of which constraint is the statistical consistency between the measured temperature and the estimated temperature. The successive quadratic programming facilitates the maximum entropy estimation. The gradient required fur the optimization procedure is provided by solving the adjoint problem. The characteristic feature of the maximum entropy method is discussed with the illustrated results. The presented results show considerable resolution enhancement and bias reduction in comparison with the conventional methods.

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OpenFOAM 과 VisualDoc 을 이용한 역열전도 문제의 해석 (Analysis of Inverse Heat Conduction Problem Using OpenFOAM and VisualDoc)

  • 김성원;김선경
    • 대한기계학회논문집B
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    • 제37권6호
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    • pp.539-544
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    • 2013
  • 본 연구는 공개 해석프로그램과 상용 최적화 프로그램을 연계하여 역열전도 문제를 해결하는 방법론을 제시하고 구현하였다. 이 해석 방법은 구동이 간단하며, 내부 코딩 없이도 구동이 가능하기 때문에 다른 연구자들도 쉽게 역열전도 문제를 재현할 수 있다.